Adsorptions of Cu²⁺ and Zn²⁺ by three typical variable charge soils and four typical constant charge soils di-f ferent in pH and in accompanying ion, Na⁺, Zn²⁺ or Cu²⁺ were determined, respectively. The results showed that adsorption of Cu²⁺ and Zn²⁺ by the soils could be described by the Langmiur equation C/(X_m) = 1/Kb+C/b both in the single ion and coexisting ions systems. The adsorption of Cu²⁺ or Zn²⁺ increased with pH and reached a plateau value when the pH value was 5. The affinity in adsorption of Cu²⁺ was greater than that of Zn²⁺. The mechanism of adsorption Cu²⁺ and Zn²⁺ was closely related to chemical composition and surface properties of the soils. The relative contribution of specific adsorption to the adsorption of Cu²⁺ and Zn²⁺ by the variable charge soils was greater than that by the constant charge soils.